Knife-stone.



ALG. RODGERS. KNIFE STONE. APPLICATION FILED MAR. 21, 1910.

1,95 9,566. Patented Apr. 22, 1913.

UNITED STTE ASHMEAD G. nonenns, OF NIAGARA FALLS, NEW-YORK, ASSIGNOR TO THE CARBO- RUNDUM COMPANY, OF NIAGARA FALLS. NEW YORK, n CORPORATION OF PENN- SYLVANIA.

KNIFE-STONE.

Specification of Letters Patent. Application filed March 21, 1910. Serial No. 550,579.

- Patented Apr. 22, 1913.

York, have invented anew and useful Knife-Stone, of which the followin is a full, clear, and exact description, re erence being had to the accompanying drawi s,

forming part of this specification, in whi Figure 1 is an edge view of my improved knife stone and Fig. 2 is a face' View of the same. I l

I My invention relates to the stone used for rubbing and sharpening knives, especially machine knives such as paper knives, planer knives, and knives of leather and cloth cutting machines. Heretofore these knives have been sharpened by removing them from the machines in which they were mounted and placing them in a special grinding machine.

My invention is designed to provide an improved rubbing stone which may be used by the operator of the knives when placed in the machine without danger to the erators fingers.

It is. also designed to provide a stone which will wear in flat faces without grooving so that the proper edge .will be given to the knife throughout its length.

In the drawing, I show a stone 2 of cylindrical. form, having a peripheral groove 3 extending around it and designed to receive the fingers of the'operator at, different oints in the circumference. In the' preferred form, this sharpening stone is molded from an abrasive such as carborundum; and I preferably form one portion or half of the stone of coarser material to have a rough working face, and the other side with 'finer grit or material for 'ving the finished .keen sharp edge to the ife.- The cylindrical .to keep its workin form allows the stone to be turned frequently by hand to prevent the formation of grooves upon the workin faces. over when the stone is pic ed up it will naturally be seized in different positions, thus keeping the working surfaces flat. The knives are often several feet long and it is necessary to maintain the cutting face in straight alinement, and this is accomplished by keeping the working face flat and substantially a plane surface.

The advantages of my invention result from the substantially cylindrical form of the stone and from the peripheral roove which gives a grip for the hand an prevents injury to the workmens fingers. The form allows frequent turning of the stone faces flat. By making the stone of two ifferent grades of abrasive or grit, the knife may be rough ground and finely ground with the same stone.

The contour of the stone as well as its size may be varied, the stone may be made of one grade of.'abrasive, the form of the groove may be altered and it need not'be continuous; and many other changes may be made without departing from my in'ven- 'tion.

I claim: I

As a new article of manufacture, a hand abrasive tool, in the form of a cylinder having flat abrading ends, and having interme i eral groove; substantiall as described.

In testimony whereo I have hereunto set my hand.-

ASHMEAD G". RODGERS.

Witnesses i w. T. BRIGGS,

PER. R. RAYNER.

ate of said ends a continuous periph-v More- 

